This is odd, I am using the latest SP1 libraries and have followed all the steps and only see this in the WPF application. The Activities column should look like a drop-down combo box when the green checkbox is showing. Obviously, I am missing something, but not sure what it is. I hope I can look at it fresh in the morning and figure it out, but if there are tips, please let me know.
My XAML has this definition for the column:
<telerik:GridViewComboBoxColumn Header="Activities"
Width = "271"
DataMemberBinding = "{Binding Description}"
SelectedValueMemberPath = "SicCodeValue"
DisplayMemberPath = "SicCodeDescription" IsLightweightModeEnabled="true" IsComboBoxEditable="True">
</telerik:GridViewComboBoxColumn>
and I set up my itemssource via code using the following line on data load:
(this.myList.Columns[2] as GridViewComboBoxColumn).ItemsSource = (ViewModel as MyViewModel).SicCodes;